Python User-Defined Functions MCQs (25)
Python Training in Vizag (Softenant)1) What is printed?
def f():
return 2 + 3
print(f())A. 5
B. 23
C. None
D. Error
2) Implicit return value?
def f():
x = 10
print(f())A. 10
B. None
C. Error
D. 0
3) Positional vs keyword call
def add(a, b):
return a + b
print(add(2, b=3))A. 5
B. TypeError
C. 23
D. None
4) Default argument used?
def greet(name="World"):
return f"Hi, {name}!"
print(greet())A. Hi, name!
B. Hi, World!
C. None
D. TypeError
5) Mutable default pitfall
def push(x, acc=[]):
acc.append(x)
return acc
print(push(1), push(2))A. [1] [2]
B. [1] [1, 2]
C. [] []
D. Error
6) Safe default pattern
def push(x, acc=None):
if acc is None:
acc = []
acc.append(x)
return acc
print(push(1), push(2))A. [1] [2]
B. [1] [1, 2]
C. [] []
D. Error
7) *args collects extra positionals
def f(a, *args):
return a, args
print(f(1, 2, 3))A. (1, (2, 3))
B. (1, [2, 3])
C. (1, 2, 3)
D. TypeError
8) **kwargs collects keywords
def f(**kw):
return sorted(kw.items())
print(f(x=1, y=2))A. {‘x’:1,’y’:2}
B. [(‘x’,1), (‘y’,2)]
C. (‘x’,1,’y’,2)
D. TypeError
9) Argument unpacking
def add(a, b, c):
return a + b + c
vals = (1, 2, 3)
print(add(*vals))A. 6
B. 123
C. TypeError
D. (1,2,3)
10) Keyword-only parameter
def f(a, *, b=0):
return a + b
print(f(2, b=3))A. 5
B. TypeError
C. 23
None
11) Positional-only (Py ≥ 3.8)
def f(a, /, b):
return a * b
print(f(2, b=3))A. 6
B. TypeError
C. 23
D. None
12) LEGB scope
x = 5
def f():
x = 7
return x
print(f(), x)A. 7 5
B. 5 5
C. 7 7
D. Error
13) global
x = 1
def f():
global x
x = 9
f()
print(x)A. 1
B. 9
C. NameError
D. UnboundLocalError
14) nonlocal
def outer():
x = 1
def inner():
nonlocal x
x = 2
inner()
return x
print(outer())A. 1
B. 2
C. NameError
D. UnboundLocalError
15) Closure capturing variable
def make_adder(n):
def add(x):
return x + n
return add
f = make_adder(10)
print(f(5))A. 10
B. 15
C. 5
D. TypeError
16) Late-binding gotcha
funcs = []
for i in range(3):
funcs.append(lambda: i)
print([f() for f in funcs])A. [0, 1, 2]
B. [2, 2, 2]
C. [1, 2, 3]
D. Error
17) Fix late-binding
funcs = []
for i in range(3):
funcs.append(lambda i=i: i)
print([f() for f in funcs])A. [0, 1, 2]
B. [2, 2, 2]
C. [1, 2, 3]
D. Error
18) Annotations are metadata
def f(x: int) -> str:
return str(x)
print(f.__annotations__['x'], type(f(5)).__name__)A. int str
B. str int
C. int int
D. None None
19) Recursion base case
def fact(n):
return 1 if n == 0 else n * fact(n-1)
print(fact(3))A. 3
B. 6
C. 9
D. Error
20) Decorator basics
def deco(f):
def wrap():
return "X" + f() + "X"
return wrap
@deco
def hello():
return "hi"
print(hello())A. hi
B. XhiX
C. XXhi
D. Error
21) Generator function returns…
def gen():
yield 1
print(type(gen()).__name__)A. list
B. generator
C. iterator
D. function
22) return vs yield
def g():
return 1
def h():
yield 1
print(g(), list(h()))A. 1 [1]
B. [1] 1
C. 1 1
D. Error
23) First-class functions
def square(x): return x*x
def apply(f, v): return f(v)
print(apply(square, 4))A. 8
B. 16
C. square
D. Error
24) Docstring
def f():
"hello"
print(f.__doc__)A. None
B. hello
C. ”
D. Error
25) Function is an object
def f(): pass
g = f
print(f is g, callable(g))A. True True
B. True False
C. False True
D. False False
Answer Key
1) A
2) B
3) A
4) B
5) B
6) A
7) A
8) B
9) A
10) A
11) B
12) A
13) B
14) B
15) B
16) B
17) A
18) A
19) B
20) B
21) B
22) A
23) B
24) B
25) A